I chose the colors. From the base, I took this colors from pictures I liked I don't know exactly where. I also play with saturation and brightness.
Yesterday night, I made an underwater life animation with these colors. You'll see it below.
To build the world, I need to know how many slides I will show (how I will present myself and my artworks) and, as I can't imagine it (it's the truth), I have to draw what I like and serendipity will make the rest. As often...
Pic of the day:

Underwater life animation with choosen colors